Research On A Pair Of Enantiopure Cu^Ⅱ₄O₄ Clusters And Pybox Ligands

A pair of enantiopure cubane-type CuⅡ4O4 clusters were constructed from simple chiral ligands. The fact that the complex is enantiomer can be concluded from the result of the single-crystal X-ray diffraction studies. The four Cu(II) in one cluster of the CuⅡ4O4 core are all in a distorted square-pyramidal geometry. Circular dichroism (CD) spectra also confirmed the complex is enantiomer, and the chirality has been successfully transferred and amplified to the coordination environment of Cu(II) ions from the ligand. Magnetic susceptibility measurements show an overall antiferromagnetic interaction.Pybox is a widely-used ligand in the field of coordination chemistry. However, the current synthesis scheme has disadvantages such as the overuse of SOCl2, low efficiency, and multiple complicated steps to follow. We herein improve this scheme by introducing the esterification reaction and the sealed tube reaction to lower the use of SOCl2 and the workload, while improving the efficiency and successfully synthesizing a series of Pybox derivatives as well. Then we use these derivatives to coordinate with the Fe(II) ion to get a variety of complexs to study the inner structures. We also obtained a special complex which can transfer into different types with the change of temperature.